Implement clearing of CompareICs.

src/x64/assembler-x64.h

 // Copyright (c) 1994-2006 Sun Microsystems Inc.
 // All Rights Reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 // - Redistributions of source code must retain the above copyright notice,
 // this list of conditions and the following disclaimer.
 //
@@ skipping 611 matching lines @@
   static const byte kTestEaxByte = 0xA9;
   // One byte opcode for test al, 0xXX.
   static const byte kTestAlByte = 0xA8;
   // One byte opcode for nop.
   static const byte kNopByte = 0x90;
 
   // One byte prefix for a short conditional jump.
   static const byte kJccShortPrefix = 0x70;
   static const byte kJncShortOpcode = kJccShortPrefix | not_carry;
   static const byte kJcShortOpcode = kJccShortPrefix | carry;
-
+  static const byte kJnzShortOpcode = kJccShortPrefix | not_zero;
+  static const byte kJzShortOpcode = kJccShortPrefix | zero;
 
 
   // ---------------------------------------------------------------------------
   // Code generation
   //
   // Function names correspond one-to-one to x64 instruction mnemonics.
   // Unless specified otherwise, instructions operate on 64-bit operands.
   //
   // If we need versions of an assembly instruction that operate on different
   // width arguments, we add a single-letter suffix specifying the width.
@@ skipping 1020 matching lines @@
  private:
   Assembler* assembler_;
 #ifdef DEBUG
   int space_before_;
 #endif
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_X64_ASSEMBLER_X64_H_